1987 - Legends #6 - Jim Shooter Byrned

http://goodcomics.comicbookresources.com/2013/10/27/meta-messages-john-byrne-burns-jim-shooter/

Len Wein, John Ostrander, and John Byrne poke a bit of fun at Mr. Shooter, disguising him as the villain Sunspot and the not-so-subtle references to the New Universe.

1981 - The Legion Outpost Cover by Jim Shooter

What if The Legion of Super Heroes was a Marvel comic? Tip of the hat to Sparky Ryan for uncovering this cover!

1983 - Avengers vs. JLA original penciled art by George Perez

1985 - DC Comics Sales Data

http://www.jimshooter.com/2011/11/comic-book-distribution.html